Grinding assembly

ABSTRACT

A grinding assembly includes a motor with a transmission pipe connected thereto and a male connector is connected to the transmission pipe. A spiral pipe is received in the transmission pipe and a steel cable extends through the spiral pipe. A distal end of the steel cable is connected to a driving member which extends through a passage in the male connector. A handle has a female connector which is connected with the male connector. The female connector includes an axle received therein which includes a connection hole defined in a first end thereof. The driving member is engaged with the connection hole. A grinding wheel is connected to a second end of the axle. A bearing is received in the male connector and the driving member extends through the bearing so that when the driving member rotates, the driving member does not contact with an inner periphery of the passage and can be operated at high speed.

BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates to a grinding assembly with a bearingcooperated with the driving member so as to work at high speed and lowheat is generated. The vibration for the grinding assembly is reducedand the term of use for the hose set can be increased.

(2) Description of the Prior Art

A conventional grinding assembly used in grinding sculptures, polishingobjects and grinding jewelry is shown in FIGS. 1 and 2, and generallyincludes a motor 1, a transmission pipe 2 connected to the motor 1, ahandle 3 which includes a grinder which is driven by the motor 1 via thetransmission pipe 2. The motor 1 is connected with a bail 11 and can behanged on a wall. The transmission pipe 2 includes a plastic outer pipe21 and a guide pipe 22 is received in the plastic outer pipe 21. Theplastic outer pipe 21 includes a plastic pipe 211 and a flexible innerbellow pipe 212 is received in the plastic pipe 211. The guide pipe 22includes a spiral pipe 221 and a steel cable 222 is received in thespiral pipe 221. The distal end of the steel cable 222 is connected to adriving member 223 which extends through a male connector 23 and isengaged with a connection hole 321 in an axle 32 in a handle 3. Thehandle 3 includes a female connector 31 with which the male connector 23is engaged. When the motor 1 is activated, the steel cable 222 drivesthe driving member 223 which rotates the axle 32 in the handle 3 togrind the object by a grinding member connected to the axle 32.

However, the distal end of the guide pipe 22 is the weakest part of theguide pipe 22 and the driving member 223 generates high frequency ofvibration so that the conventional grinding assembly can only beoperated at maximum revolution of 1800 rpm. Besides, the driving member223 is in contact with the inner periphery of the passage in the maleconnector 23 so that high temperature is generated and the maleconnector 23 sometimes is broken by the vibration and high temperature.The vibration of the driving member 223 causes the grinding member to bedifficult to control so that the conventional grinding assembly cannotbe used for precision grinding. Furthermore, the guide pipe 22 might bebroken and injure people.

The present invention intends to provide a grinding assembly wherein thedriving member is supported by a bearing so that the driving member canoperation at high speed without causing too much friction and heat.

SUMMARY OF THE INVENTION

The present invention relates to a grinding assembly which comprises amotor and a transmission pipe has one end connected to the motor and amale connector is connected to the other end of the transmission pipe.The transmission pipe includes soft hose and a guide pipe which isreceived in the soft hose. The soft hose includes a plastic outer pipeand an inner bellow pipe is received in the plastic outer pipe. Theguide pipe includes a spiral pipe and a steel cable which extendsthrough the spiral pipe. A distal end of the steel cable is connected toa driving member which extends through a passage in the male connector.A handle has a female connector which is connected with the maleconnector. The female connector includes an axle received therein andthe axle includes a connection hole defined in a first end thereof. Thedriving member is engaged with the connection hole. A grinding wheel isconnected to a second end of the axle. A bearing is received in the maleconnector and the driving member extends through the bearing.

The present invention will become more obvious from the followingdescription when taken in connection with the accompanying drawingswhich show, for purposes of illustration only, a preferred embodiment inaccordance with the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view to show a conventional grinding assembly;

FIG. 2 is a cross sectional view to show the conventional grindingassembly;

FIG. 3 is an exploded view to show the grinding assembly of the presentinvention;

FIG. 4 is a perspective view to show the grinding assembly of thepresent invention, and FIG. 5 is a cross sectional view to show thegrinding assembly of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 3 to 5, the grinding assembly of the presentinvention comprises a motor 4 with a bail 41 connected thereto so thatthe motor 4 can be hanged on a wall. A transmission pipe 5 has one endconnected to the motor 4 and a male connector 53 is connected to theother end of the transmission pipe 5. The male connector 53 includes apassage 531 which includes a first space and a second space. The firstspace is larger than the second space.

The transmission pipe 5 includes a soft hose 51 and a guide pipe 52which is received in the soft hose 51, the soft hose 51 includes aplastic outer pipe 511 and an inner bellow pipe 512 received in theplastic outer pipe 511. The guide pipe 52 includes a spiral pipe 521 anda steel cable 522 which extending through the spiral pipe 521. A distalend of the steel cable 522 is connected to a driving member 523 whichextends through the passage 531 in the male connector 53. A bearing 532is received in the first space of the passage 531 of the male connector53 and the driving member 523 extends through the bearing 532 so that agap defined between an inner periphery of the passage 531 and thedriving member 523.

A handle 6 has a female connector 61 which is connected with the maleconnector 53. The female connector 61 includes an axle 62 receivedtherein and the axle 62 includes a connection hole 621 defined in afirst end thereof. The driving member 523 is engaged with the connectionhole 621 so as to drive the axle 62. A grinding wheel is connected to asecond end of the axle 62.

The bearing 532 supports the driving member 523 which can be operated athigh speed without generating too much vibration. The maximum speed canreach 3000 rpm. A gap is defined between the driving member 523 and theinner periphery of the passage 531 so that no friction causing high heatwhen operating the grinding assembly. The user holds the handle 6 whichdoes not shake and have high temperature so that the grinding assemblycan be used on precision grinding.

While we have shown and described the embodiment in accordance with thepresent invention, it should be clear to those skilled in the art thatfurther embodiments may be made without departing from the scope of thepresent invention.

What is claimed is:
 1. A grinding assembly comprising: a motor; atransmission pipe having one end connected to the motor and a maleconnector connected to the other end of the transmission pipe, thetransmission pipe including soft hose and a guide pipe which is receivedin the soft hose, the soft hose including a plastic outer pipe and aninner bellow pipe received in the plastic outer pipe, the guide pipeincluding a spiral pipe and a steel cable which extending through thespiral pipe, a distal end of the steel cable connected to a drivingmember which extends through a passage in the male connector; a handlehaving a female connector which is connected with the male connector,the female connector including an axle received therein and the axleincluding a connection hole defined in a first end thereof, the drivingmember engaged with the connection hole, a grinding wheel connected to asecond end of the axle, and a bearing received in the male connector andthe driving member extending through the bearing so that a gap definedbetween an inner periphery of the passage and the driving member.
 2. Theassembly as claimed in claim 1, wherein the passage includes a firstspace and a second space, the first space being larger than the secondspace, the bearing is engaged with the first space.
 3. The assembly asclaimed in claim 1, wherein a bail is connected to the motor.